I am looking at the Tremec TKO 600 tranny for my 70 Mustang. I have heard both ways about having to cut the tunnel to get the pinion angle correct. I am looking for someone who has actually done this modification to help me out. Does anyone know of a good step by step article of how this modification is done? My main questions are how much higher must the tunnel be raised and what is the correct (safe) pinion angle? Remember this is for a 69/70, not 66-68. Thanks for the help.